[RichardJ]

You're missing a part that goes on the end of the lower clutch rod.
In the first image it is item #21 and goes on the end of rod #20. It just slips on and is shown in your post #6 above as lubrication point 101.
I saw another thread that shows this item and they threaded the rod to hold it in place, but that is not necessary.
You should get the correct spring and connect it on the frame and not the engine block.

In the drawing, rod #26 is at a strange angle. This drawing may be for a Forward Control Vehicle where the peddle assembly is above and ahead of the bellhousing.